Electrochemically-mediated amine regeneration of CO2 capture: From electrochemical mechanism to bench-scale visualization study

Wang, Xiaomei; Fan, Huifeng; Sharif, Maimoona; Yu, Yunsong; Wei, Keming; Zhang, Zaoxiao; Liu, Guangxin

doi:10.1016/j.apenergy.2021.117554

Cited by 22 publications

(9 citation statements)

References 35 publications

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“…The chemical reduction of considerable Cu 2+ ions improved the anisotropic growth of microparticles. Cu 2+ ions, as a transition metal, are inclined to bond to MEA to form [Cu(MEA) 2 ] 2+ in the presence of MEA in the precursor solution [ 28 ]. The UV-vis absorption spectra of precursor solutions also demonstrated that the absorption edge of Cu 2+ ions decreased and then the absorption peak of [Cu(MEA) 2 ] 2+ rose as the addition of MEA increased, which illustrated that the Cu 2+ ions were made more complex by MEA with [Cu(MEA) 2 ] 2+ formation ( Figure 4 ).…”

Section: Resultsmentioning

confidence: 99%

“…To produce ethanol efficiently, some researchers have also combined Cu compounds with other metal and semiconductor materials on the electrode interface. Cu@VO 2 [ 27 ] and Au x /Cu 2 O [ 28 ] electrocatalysts were skillfully designed for ethanol generation, and their catalytic mechanisms were proposed. Molecular CO generated on Au or VO 2 shifts to the adjacent Cu element, reducing the free energy of *COCO formation.…”

Section: Introductionmentioning

confidence: 99%

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Concentration Optimization of Localized Cu0 and Cu+ on Cu-Based Electrodes for Improving Electrochemical Generation of Ethanol from Carbon Dioxide

Wang

Zhou

et al. 2022

IJMS

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Copper-based electrodes can catalyze electroreduction of CO2 to two-carbon products. However, obtaining a specific product with high efficiency depends on the oxidation state of Cu for the Cu-based materials. In this study, Cu-based electrodes were prepared on fluorinated tin oxide (FTO) using the one-step electrodeposition method. These electrodes were used as efficient electrocatalysts for CO2 reduction to ethanol. The concentration ratio of Cu0 and Cu+ on the electrodes was precisely modulated by adding monoethanolamine (MEA). The results of spectroscopic characterization showed that the concentration ratio of localized Cu+ and Cu0 (Cu+/Cu0) on the Cu-based electrodes was controlled from 1.24/1 to 1.54/1 by regulating the amount of MEA. It was found that the electrode exhibited the best electrochemical efficiency and ethanol production in the CO2 reduction reaction at the optimal concentration ratio Cu+/Cu0 of 1.42/1. The maximum faradaic efficiencies of ethanol and C2 were 48% and 77%, respectively, at the potential of −0.6 V vs. a reversible hydrogen electrode (RHE). Furthermore, the optimal concentration ratio of Cu+/Cu0 achieved the balance between Cu+ and Cu0 with the most favorable free energy for the formation of *CO intermediate. The stable existence of the *CO intermediate significantly contributed to the formation of the C–C bond for ethanol production.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Concentration Optimization of Localized Cu0 and Cu+ on Cu-Based Electrodes for Improving Electrochemical Generation of Ethanol from Carbon Dioxide

Wang

Zhou

et al. 2022

IJMS

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“…A final alternative is promoting the electrochemically mediated amine regeneration, where heating is no longer required. The latter is discussed in more detail later in section 3.1 [43,44] …”

Section: Co2 Source: Capture and Delivery Technologiesmentioning

confidence: 99%

A State‐of‐the‐Art Update on Integrated CO₂ Capture and Electrochemical Conversion Systems

et al. 2022

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To valorize waste CO2, capturing and utilizing it to produce chemical building blocks is currently receiving a lot of attention. In this respect, amine and alkali base solutions have shown to be efficient CO2 capturing solutions and electrochemical CO2 conversion is a promising technology to convert CO2 and, as such, reduce greenhouse gas emissions. However, to date, CO2 capture and utilization (CCU) technologies have been investigated almost exclusively as separate processes. This has the disadvantage that CO2 has to be desorbed and compressed from the capture solution before sending it to the CO2 electrolyzer, seriously increasing the capital and operational costs of the overall technology. To improve the valorization potential of the CCU technologies, integrating both technologies by directly utilizing the capture solution as an electrolyte for the electrochemical CO2 reduction (eCO2R) is a highly promising approach. This technology is however limited by low Faradaic efficiencies (FE) and partial current densities that can be achieved with these solutions. The main reason for this is the slow CO2 release rate at the catalytic interphase. Nevertheless, in recent years, in light of tackling these challenges, several studies successfully managed to decrease the costs of the CO2 capturing step and to electrochemically convert more efficiently the CO2 capture solutions. Herein, we review the status of the integrated CO2 capture and electrochemical conversion technology, discussing the recent developments and advances both in the field of CO2 capture and eCO2R.

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“…A systematic analysis of several transition metals was performed along with monoamines, diamines, and polyamines to determine the best chemistry for the EMAR process. 102,103 A combination of Cu as the metal and EDA as the amine was found to be an effective chemistry, owing to the high CO 2 capacity (i.e., B0.5 mol CO 2 per mol EDA ), high stability constant of the copper complexation with EDA, suitable reduction potential of the complex, good reversibility, and low cost. 100,102 Based on this chemistry and using the EMAR technique, continuous CO 2 capture from flue gas was accomplished for 50 hours of operation, spanning 25 sucessive cycles of absorption and desorption.…”

Section: Electrochemically Mediated Amine Regenerationmentioning

confidence: 99%

Electrochemical carbon capture processes for mitigation of CO₂ emissions

et al. 2022

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Electrochemically-mediated amine regeneration of CO2 capture: From electrochemical mechanism to bench-scale visualization study

Cited by 22 publications

References 35 publications

Concentration Optimization of Localized Cu0 and Cu+ on Cu-Based Electrodes for Improving Electrochemical Generation of Ethanol from Carbon Dioxide

Concentration Optimization of Localized Cu0 and Cu+ on Cu-Based Electrodes for Improving Electrochemical Generation of Ethanol from Carbon Dioxide

A State‐of‐the‐Art Update on Integrated CO₂ Capture and Electrochemical Conversion Systems

Electrochemical carbon capture processes for mitigation of CO₂ emissions

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Electrochemically-mediated amine regeneration of CO2 capture: From electrochemical mechanism to bench-scale visualization study

Cited by 22 publications

References 35 publications

Concentration Optimization of Localized Cu0 and Cu+ on Cu-Based Electrodes for Improving Electrochemical Generation of Ethanol from Carbon Dioxide

Concentration Optimization of Localized Cu0 and Cu+ on Cu-Based Electrodes for Improving Electrochemical Generation of Ethanol from Carbon Dioxide

A State‐of‐the‐Art Update on Integrated CO2 Capture and Electrochemical Conversion Systems

Electrochemical carbon capture processes for mitigation of CO2 emissions

Contact Info

Product

Resources

About

A State‐of‐the‐Art Update on Integrated CO₂ Capture and Electrochemical Conversion Systems

Electrochemical carbon capture processes for mitigation of CO₂ emissions